I run a putz 36z and have went through 2 nitrogen bags within the last 2 years. Is there a bigger problem here that I'm not seeing? My Accumulator pressure is about 170 which I think it should be 190, but over time it will gradually reduce in pressure. I have noticed my s-tube shifting slower. Does anyone else have this problem? thanks Mike

We have been having trouble with 4 litre bladders for many years now. Tried every brand with no great success ..... so would go for years other in months.

We started using Hydac brand (Germany) and thought we were on a winner. Last week, a second one went down, this time the bag went where the seam was vulcanized.

Now we are considering going with "piston type" made in our own factory.

Putzmeister offers a retro for the 4 liter bottles to 6 liter bottle and you will no trouble with it fo r a long time spend the money do the retro